Malicious PDF — malware analysis report

Static analysis result for SHA-256 f500b3c9cea8fb93…

MALICIOUS

PDF

72.3 KB Created: 2021-09-02 07:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c288b453b3f43736e1ffb70a823b5161 SHA-1: 9b805f20269f568c2442fbe3f6e796156c6de039 SHA-256: f500b3c9cea8fb93759418405cb59f47056286b7214fe79a60aed680e2c11dbd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. The heuristics indicate it functions as a link farm, distributing links across numerous domains, many of which appear to be compromised CMS uploads or disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pixomot.ru/uplcv?utm_term=obtuse+triangle+degrees PDF link annotation
    • http://phs1961.com/clients/2/29/29da8dc1278d8f1c58a3d16208bcb4e7/File/71824914523.pdfIn PDF document text
    • http://webursitet.org/Files/file/fesukoviw.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e6a65ee16b76522bc60f0a9360e91874/6525041383.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/xegemokuromavoxozelupaxiz.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/fogesopuxuraduxapomo.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/jisofobiludinagefepitozef.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/jigoponoruzizovojoje.pdfIn PDF document text
    • http://riverbendhay.com/clients/4/4e/4e1cbd84181290ddb66fb035c9950ff6/File/vukoputobumiwubobubexam.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/5266069186.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/dbb5695f50c7b91e9503b45dd03db350/95523291053.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/71840944549.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/zolesabekerejudax.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/zovejunuboliwixita.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/kafamedifofota.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/4142273676.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/mifubenu.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/35973963131.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/20961666967.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/65619466023.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/4d0324a02212110620800fb8582c057a/71424336724.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af25da2830---xosonelonovavej.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/4942cbfe3c2f645fb27f424070c7a694/sawel.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/1fhje4cflhdnkfq289o23554ml/newivawesidibisejam.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/2honkc93uaqfe6tp4pdctavr4h/sirodesokunemal.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/pojogiguwuraridinaxeriron.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/povibavejep.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBECE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E0 14276 bytes
SHA-256: 980e12e56bef2d59d9a619967a25fd0df9fb7578f6544e3a8d3f9aecac442aa9
font_02_sfnt_off0000fa70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA70 10568 bytes
SHA-256: 303d5949c7fe2bcb7df1c44bbdcd24b331b438d41cdddb945981ea2f886609f5